Linux Compiling Error - vorbisfile not found although insta

Hi all,
I try to compile Goldendict on Debian. I have installed all the necessary dependencies, including vorbis-dev, as listed in the 'README.md' file. However, I'm running in the following error message when doing 'qmake' or 'qmake-qt4'.
JohnDoe@debian:~/goldendict$ qmake
Project MESSAGE: Install Prefix is: /usr/local
sh: 1: pkg-config: not found
Project ERROR: Package vorbisfile not found
JohnDoe@debian:~/goldendict$
I have tried to install it without the audio player support, but it's not working either.
JohnDoe@debian:~/goldendict$ sudo qmake "DISABLE_INTERNAL_PLAYER=1"Project MESSAGE: Install Prefix is: /usr/local
sh: 1: pkg-config: not found
Project ERROR: Package vorbisfile not found
JohnDoe@debian:~/goldendict$
How can I get this work? Any help is welcome.
PS: Here's the proof that the vorbis package is installed.
PROOF from dpkg
JohnDoe@debian:~$ dpkg -s libvorbis-dev
Package: libvorbis-dev
Status: install ok installed
Priority: optional
Section: libdevel
Installed-Size: 1715
Maintainer: Debian Xiph.org Maintainers <pkg-xiph-maint@lists.alioth.debian.org>
Architecture: amd64
Multi-Arch: same
Source: libvorbis
Version: 1.3.4-2
Depends: libogg-dev, libvorbis0a (= 1.3.4-2), libvorbisenc2 (= 1.3.4-2), libvorbisfile3 (= 1.3.4-2)
PROOF from apt-get
JohnDoe@debian:~/goldendict$ sudo apt-get install libvorbis-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
libvorbis-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
JohnDoe@debian:~/goldendict$
I try to compile Goldendict on Debian. I have installed all the necessary dependencies, including vorbis-dev, as listed in the 'README.md' file. However, I'm running in the following error message when doing 'qmake' or 'qmake-qt4'.
JohnDoe@debian:~/goldendict$ qmake
Project MESSAGE: Install Prefix is: /usr/local
sh: 1: pkg-config: not found
Project ERROR: Package vorbisfile not found
JohnDoe@debian:~/goldendict$
I have tried to install it without the audio player support, but it's not working either.
JohnDoe@debian:~/goldendict$ sudo qmake "DISABLE_INTERNAL_PLAYER=1"Project MESSAGE: Install Prefix is: /usr/local
sh: 1: pkg-config: not found
Project ERROR: Package vorbisfile not found
JohnDoe@debian:~/goldendict$
How can I get this work? Any help is welcome.
PS: Here's the proof that the vorbis package is installed.
PROOF from dpkg
JohnDoe@debian:~$ dpkg -s libvorbis-dev
Package: libvorbis-dev
Status: install ok installed
Priority: optional
Section: libdevel
Installed-Size: 1715
Maintainer: Debian Xiph.org Maintainers <pkg-xiph-maint@lists.alioth.debian.org>
Architecture: amd64
Multi-Arch: same
Source: libvorbis
Version: 1.3.4-2
Depends: libogg-dev, libvorbis0a (= 1.3.4-2), libvorbisenc2 (= 1.3.4-2), libvorbisfile3 (= 1.3.4-2)
PROOF from apt-get
JohnDoe@debian:~/goldendict$ sudo apt-get install libvorbis-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
libvorbis-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
JohnDoe@debian:~/goldendict$